import pygame.font

class Button():
    def __init__(self,ai_settings,screen,msg):
         #初始化按钮的属性
         self.screen = screen
         self.screen_rect = screen.get_rect()

         #设置按钮的尺寸和其他属性
         self.width,self.height = 200,50
         self.button_color = (0,255,0)
         self.text_color = (255,255,255)
         
         # 实参None 让Pygame使用默认字体，而48 指定了文本的字号
         self.font = pygame.font.SysFont(None,48)

         #创建按钮的rect对象，并使其居中
         self.rect = pygame.Rect(0,0,self.width,self.height)
         self.rect.center = self.screen_rect.center

         # 按钮的标签只需创建一次
         self.prep_msg(msg)
    
    def prep_msg(self,msg):
        # 将msg渲染为图像，并使其在按钮上居中
        self.msg_image = self.font.render(msg,True,self.text_color,self.button_color)
        self.msg_image_rect = self.msg_image.get_rect()
        self.msg_image_rect.center = self.rect.center
    
    def draw_button(self):
        # 绘制一个用颜色填充的按钮，再绘制文本
        self.screen.fill(self.button_color,self.rect)
        self.screen.blit(self.msg_image,self.msg_image_rect)
